Abstract

Dyes are widely used as additives in the food industry. As some dyes may pose health risks when being in contact with food, their removal in industrial processes is an important issue. Since the surfactant sodium dodecyl sulphate (SDS) covers a wide range of variety of task to remove oily materials, and it is often used in detergency processes, the association of some relevant dyes to SDS micellar aggregates has been investigated. In particular, the binding constants of the dyes, bromophenol blue, malachite green, crystal violet, congo red, calcon, methyl orange, and methyl red, to the SDS micelles have been measured using a UV-Vis spectrophotometric method. In all cases, a strong association of the different substrates has been probed. Los colorantes son ampliamente usados como aditivos en la industria alimentaria. Debido a que algunos de estos colorantes, por estar en contacto con alimentos, presentan riesgos para la salud, su eliminación en procesos industriales es un tema importante. Puesto que el dodecil sulfato sódico (SDS) cubre un amplio rango en la eliminación de materiales aceitosos y es frecuentemente usado en procesos de detergencia, se ha investigado la asociación de diversos colorantes a agregados micelares de SDS. En particular, se han medido por un método espectrofotométrico UV-Vis las constantes de asociación de los colorantes azul de bromofenol, verde malaquita, violeta cristal, rojo congo, calcon, naranja de metilo y rojo de metilo a micelas de SDS. En todos los casos se observó una fuerte asociación de los diferentes sustratos, lo que demuestra su aplicabilidad en procesos de detergencia.

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